Abstract: A strainer drum for straining pulp and the like comprises a substantially circular cylindrical mantle formed by a number of strainer elements provided with strainer openings, which strainer elements are held together between at least two gables to form the mantle.

Abstract: A heat exchanger comprises a plurality of first plates clamped in a frame-work. The plates are generally rectangular and have an opening at each of their corners, said opening forming together with corresponding openings of adjacent plates a first manifold duct for a heat exchanging fluid. A plurality of second plates have a recess at one or more of their corners, said recess corresponding to said openings of the first plates. A connection piece connected to said first manifold duct is clamped in the space formed by the recesses. All the plates have an additional opening forming a second manifold duct through which said first manifold duct is connected to the heat exchanging passages.

Abstract: A multiple hydrocyclone assembly comprises a housing, a plurality of groups of radially extending cyclones provided at different levels in said housing, and inlet and outlet conduits connected to the bottom portion of the assembly. In order to avoid collection of air in the housing the outlet conduit comprises a central tube extending vertically through the housing to the top portion thereof.

Abstract: From a row of objects which are conveyed on an intermittently movable feeding conveyor, every second object is deposited on lines of wrapping materials at a first station, which lines are advanced continuously under the feeding conveyor, and the remaining objects are deposited on the same lines of wrapping materials at a following station. In connection with one or both depositing steps, the objects are shifted transversely of the direction in which said lines are advanced. Thus, the number of lines of wrapping material is only half the number of objects in each row, whereas the distance between the lines will be increased so much that the lines may be sealed lengthwise and crosswise by means of rotating sealing means.

Abstract: A rotary compressor has an outlet port with a variable area for discharging compressed medium from a working chamber to the outlet. The degree of opening of the outlet port is controlled by a regulator which senses the energy supplied to the compressor for compressing the medium and which from time to time changes the degree of opening of the outlet port until the need of drive energy for the compressor becomes minimal.

Abstract: In an assembly of spaced heat exchange plates, each second interspace is sealed from the surrounding atmosphere by gasket means extending along the periphery of the adjacent plates forming such interspace, the other interspaces being sealed from the surrounding atmosphere by permanent joints between the adjacent plates forming said other interspaces. The plates have pressed corrugations in their heat exchanging surfaces and also have pressed grooves extending around said surfaces for receiving the gasket means. The permanent joints are formed along abutting bottoms of the pressed grooves of the respective adjacent plates. The seals formed by said joints and the seals formed by the gasket means are disposed in aligned relation across the plate heat exchanger.

Abstract: An evacuable casing for a rotor machine comprises a cover surrounding the machine, bearing means mounting the cover for rotation on a foundation, the cover having an endless base edge, and sealing means extending along the base edge to seal against the foundation when a vacuum is applied within the cover. One part of the cover is mounted for movement relative to a second part of the cover to form a large opening in the cover, this opening in combination with said rotation of the cover on the foundation providing easy access to the machine from any radial direction.

Abstract: The invention relates to a heat exchanger intended for cooling of a fluid when a compressed refrigerant is evaporated. The heat exchanger comprises one or more plate-shaped pressure cells (1, 1', 1") provided with inlet (6) and outlet (9) for refrigerant. The pressure cell consists of thin plates which have been joined together along their outer edges and at points over the heat exchange surface. The pressure cell is surrounded by a container (2) for the fluid which is to be cooled when the refrigerant changes its state.

Abstract: In a centrifugal rotor having an axially movable slide for opening and closing peripheral outlets from the separating chamber, there is formed a so-called closing chamber between the slide and the rotor body. The closing chamber is charged with operating liquid from the central axis of the rotor through a channel in the rotor. In the passage between the channel and the closing chamber are means by which the hydraulic pressure exerted on the slide from operating liquid in the channel is first reduced or eliminated in connection with discharge of operating liquid from the closing chamber and thereafter is again caused to act for closing of the slide.

Abstract: A method for freeze-stabilizing wine and a system for carrying out this method are described. The method is of a type in which the wine is first chilled so that ice crystals are formed in the wine while the wine is still pumpable, whereupon the wine is conveyed to a residence tank in which tartrate crystals are formed. The wine is then heated to melt the ice crystals, whereupon the tartrate crystals formed are removed from the wine. The method according to the invention is characterized in that the wine is conveyed continuously to and from the residence tank, where the wine is agitated in such a way that there is maintained a homogeneous suspension of ice crystals and tartrate crystals in wine. It is advantageous to stir the wine with a horizontally pivoted stirrer which rotates at a relatively low speed. Suitable operating conditions are obtained if the wine is first chilled to a temperature which is 0.2.degree. to 5.degree. C.

Abstract: Within a cylindrical barrel to be secured to the water faucet are a basket surrounding a mixing chamber, a diffuser overlying the mixing chamber and forming a diffusing chamber, having peripheral openings for flow of water to the mixing chamber, and a flow restrictor disc having a control opening for admitting water from said faucet to the diffusing chamber, the diffuser having resilient detents allowing the disc to be snapped into position on a seat of the diffuser where the disc is releasably retained by the detents. Preferably, a ring surrounds and supports the diffuser and forms therewith a passage for flow of water from the diffuser openings to the mixing chamber, the ring being supported on part of the basket.

Abstract: The invention relates to a process for recovery of meal of high protein quality and oil from fish. To obtain a high protein quality in fish meal, one or both of the conditions of short process time and low temperature are essential factors. In the process according to the invention, the heating of the fish mass is carried out in any conventional way, and oil is separated from the heated fish mass by means of a centrifuge provided with a separate outlet for separated oil phase. The new and characterizing feature of the invention is that the stick water and sludge discharged from the centrifuge are fed together to an evaporation unit where the mixture of sludge and stick water is fed through one or several indirectly heated tubes, the internal walls of which are continuously cleaned by means of a scraping device and the outlet of which is connected to a separation space for steam and evaporated product. Finally, the evaporated product is dried in any known way.

Abstract: This invention relates to centrifugal separators of the kind having sludge ports at the rotor periphery to be opened during operation and separate outlets for separated heavier liquid phase and separated lighter liquid phase. To reduce the losses of valuable lighter liquid phase during total discharge or partial discharge of the separator by opening the sludge ports, the centrifuge is provided with an overflow device connected to the heavy phase outlet, said overflow device having an inner annular overflow and also having a number of passages at a larger diameter than the inner overflow border. The passages are dimensioned to let through all heavier liquid phase in normal operation but not to let through an increased amount of heavier liquid phase fed to the separator just before opening the sludge ports for the purpose of displacing the interface between the heavier and the lighter liquid phase towards the rotor axis to a level that corresponds to said inner overflow border.

Abstract: A filter device comprising a tubular housing with an inlet for the fluid to be filtered in one end of the housing, an outlet for filtrate in the opposite end of the housing and a filter tube mounted inside the housing and extending essentially in the axial direction of the tubular housing. At least part of the filter tube wall forms the filter surface. One end of the filter is openly connected to said inlet, whereas the other end is closed so that an annular feed conduit is formed between the housing and the filter tube. A first valve means is arranged inside the filter tube to shut off the filter tube, during cleaning periods, thereby dividing the filter tube and the filter surface into an upstream part and a downstream part, and forcing the entire filtrate stream to pass through said upstream part of the filter surface into the filtrate conduit.

Abstract: A separator for separating coarse particles from cellulose pulp suspensions and the like comprises a first separation chamber provided with an inlet for incoming mixture, a first outlet for the light fraction, and an outlet for an intermediate fraction enriched in coarse particles. A second separation chamber is provided with a second inlet, a second outlet for a light return fraction, and an outlet for separated heavy fraction, the outlet for intermediate fraction being connected to the second inlet leading from a first zone in the first separation chamber. Said zone has a higher pressure than a second zone connected to the second outlet, the second zone being located in the first separation chamber or connected to the latter, the first and second separation chambers thus communicating to form a circuit.

Abstract: A heat exchanger equipped for indirect heating, stirring and steam removal is charged with a finely divided fish mass, whereafter a combined boiling and drying procedure is carried out in the heat exchanger with essentially continuous heat supply and steam removal until the heat exchanger contains fish meal with a desired low water content and oil content. The oil removal is effected during part of the period for said boiling and drying procedure by feeding fish mass from the heat exchanger to a decanter having three separate outlets for separated sludge phase, oil phase and water phase while continuously recirculating to the heat exchanger the sludge phase separated in the decanter, removing separated oil for storing or further treatment, and removing separated stick water, at least part of the stick water being recirculated to the heat exchanger and/or being remixed with the fish mass discharged from the heat exchanger to be fed into the decanter.

Abstract: The method is intended for separating a flow of pulp containing impurities of coarse particles, partly light and partly heavy particles, by means of a main sieve or the like, into at least one pulp flow and one coarse reject flow. The coarse reject flow is separated by a hydrocyclone separator of a known type into a pulp flow, a light reject flow and a heavy reject flow. Advantageously, the light reject flow is separated by a bow sieve into a flow enriched in light particles and a flow enriched in fibers and which may be returned to the main sieve.

Abstract: A milk flow indicator comprises a housing in which the milk is adapted to flow upwardly through a seat coacting with a non-return valve having a density higher than that of the milk. The valve is movable upwardly by said milk flow to a first, open position and is movable downwardly, upon cessation of said milk flow, to a second, closed position under the influence of gravity, the sinking velocity and distance of movement of the valve being such that movement of the valve means to said second position takes place after a predetermined time delay.

Abstract: The invention relates to a method and an arrangement for cleaning cutting fluid used for metal machining. The cutting fluid is withdrawn from the collecting tank (1) at a metal cutting machine by means of vacuum and conveyed to a central cleaning plant by way of a container (3) connected to a vacuum pump. From the cleaning plant the cutting fluid is returned to the collecting tank (1) at the metal cutting machine. The cleaning plant may with advantage comprise a separation tank (6), where separation takes place by gravity and a centrifugal separator (8).

Abstract: A method for winterizing (dewaxing) of vegetable oils is described. The method is of an art, comprising the steps of neutralizing the oil, chilling it, mixing in an alkali solution, slow stirring during a residence time to make waxes and other high melting matters precipitate, and removal of same.The present method is especially characterized by the fact that the neutralizing is driven to a soap content of 100-7000 ppm, and that the oil is chilled to a temperature below 15.degree. C., preferably 5.degree.-15.degree. C., and that lye or other alkali is added, corresponding to 0.01-0.06 kgs NaOH per 100 kgs oil, the sequence chilling/addition being optional, whereupon 3-10 kgs water per 100 kgs oil are added with intense agitation, and the mixture so obtained is stirred slowly for more than 1 hour, preferably 1-7 hours, whereupon the mixture so obtained is separated into a heavy fraction, containing water- lye- soap- waxes- and other high melting matters and a lighter fraction consisting of the winterized oil.